Integration testing is a type of software testing that involves testing the integration of different components or systems to verify that they work together as intended. The goal of integration testing is to ensure that the different components of a software application or system are able to communicate and exchange information with each other correctly.

Integration testing is typically performed after unit testing and before system testing. It is an important part of the software development process, as it helps to ensure that the different components of the system are able to work together as a cohesive whole.

There are several different types of integration testing, including:

• Bottom-up integration testing, which involves testing the integration of lower-level components first and then moving up to higher-level components.
• Top-down integration testing, which involves testing the integration of higher-level components first and then moving down to lower-level components.
• Big bang integration testing, which involves testing the integration of all components at the same time.

Integration testing is typically performed by developers or testers, and is usually automated to ensure that it can be repeated consistently.